| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To enhance the real time nature and reliability in one to N communication in which the respective nodes use connectionless communication means in an intranet. <P>SOLUTION: Diagnostic processes 3 for multicast or broadcast are provided in the respective nodes 1<SB>1</SB>to 1<SB>N</SB>, and in the diagnostic processes, participation/leaving of other nodes to/from a multicast or broadcast group is monitored and the information about the nodes participated as the group is given to a communication process 2 as the node information 4. In a communication process of a transmitting node, packet transmission to other nodes is performed by broadcasting or multicasting based on the node information to store data in the packet transmission by its serial number management, in a communication process of a receiving node, re-transmission to the transmitting node is requested when omission, duplication of a received packet occur by the serial number management and in the communication process of the transmitting node re-transmission processing of the packet is performed only to the node when there is a re-transmission request. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
